Rolling mill



. Gli-:Low

ROLLING MILL Aug.' 20, i929.

Filed Nov. 22, 1927 Il I 4 w o o Patented Aug. 20, 1929.

UNITED STATES CHRISTIAN GIELOW. F DUSSELDORF-OBEBKASSEL, GERMANY.

ROLLING MILL.

Application filed November 22, 1927, Serial No.

This invention relates to a rolling-mill'for purifying and opening clay, loam and siuular materials. I am aware of the existence of rolling-mills so designed as to be adapted to remove automatically foreign bodies, such as lime, stones, brown-coal and the like. All known machines suffer however from quick obstruction, strong wear and tear, and great consumption of power.l

These drawbacks are obviated by my present invention which relates to a rolling-mill, in which the clay or the like is not only puritied, but also opened. This improved rollingmill is illustrated diagrammatically and by way of example on the accompanying drawing,r on which Fig. 1 is a vertical longitudinal section through the mill, and

Fig. 2 a horizontal section through the same.

On the drawing a denotes a cylinder with a smooth circumferential surface, and I)y is a cylinder or drum provided with longitudinal ribs b. The cylinder a is affixed to a shaft c supported in bearings f and g, and the cylinder b, b is affixed to a shaft d supported inbearings e and h. The bearings themselves are supported on girders 11 and k. The shaft c is provided with a pulley Z and the shaft (Z is provided with a pulley m. Power is ap plied to the two cylinders by these pulleys which are driven from any suitable source of power. The material to be treated between the smooth cylinder a and the ribbed cylinder b, b is supplied to these cylinders through a hopper p q or the like. denotes a scraper removing from the cylinder a the material adhering to it.

The cylinders are rotated with very different speeds wherein resides an important and characteristic featurev of the invention. The number of revolutions of the cylinder c amounts to about one hundred per minute, whereasthe cylinder b performs only very few revolutions in a minute, say 2. I wish it, r however, to be understood, that these numbers are stated merely by way of example. They may be varied according to the material to be treated and to the condition of the same.

'When the material' to loe treated is introduced into the hopper p Q and supplied by it to the cylinders, it is squeezed by the'- quickly rotating cylinder a-into the spaces between the ribs of the slowly rotating cylinder 7) b', until these spaeesv are completely 'filled up. Assuming the material be clay, then the cylin- 235,053, and in Germany November 25, 1926.

der I) b will loe converted so to say into an elastic clay cylinder, the circumferential surface rof which contacts with the smooth circumferential surface of the cylinder a. The contacting surfaces exert a pulling action upon the material presentbetween them 'and the feed-hopped, .and a certain amount of the material is constantly withdrawn from the supply and converted into a sheet m, as shown in Fig. 1. The impurities contained in the material supplied from above, i. e. stones, and

the like, are, however, retained in the spaces between the ribs b', that is to say, they are retained within the material present between the ribs, and they. can. be retained therein owing to the material being a soft mass 'in which the hard impurities are not crushed, as is the case with the known rolling-mills mentioned in the introductory part of this-specification. y

In the same measure in which the hard impurities enter into the soft material present between the ribs, a corresponding amount of the soft material is pressed out of said-spaces and is caused to leave the machine by joining,

the sheetm.

They are, of course, provided means (not shown) for adjusting' the cylinders relatively to one another, that is to say. the `grap which must exist between the cylinders in order to let pass the sheet w canloe varied according to the requirements. When inally, the spaces between the ribs b are practically completely filled with the impurities, the mill is stopped and the said spaces are emptied, or cleaned respectively.

The cylinder b b may be completely open around its circumference, but it is as well possible to provide it with a casing` or jacket extending from the feed-hopper to the place where the sheet w leaves the mill. A casing or iacket of this size is indicated in Fig. 1 by the dotted line denoted r.

What I claim is:

1.* A rolling mill for purifying' and opening` clay. loam or the like. comprising, in combination. a rotary cylinder having a solid circumferential surface, another rotatory cylinder, means on the surface of said cylinder to receive and hold on its circumferential. surface a layer of the material to be purified and opened, and means for rotating the firstmentioned roller with a speed considerably higher thanthe speed of the other cylinder and in opposite directions to eac-h other, substantially as set forth.

2. A rolling mill for purifying and opentions ot' the material to be purified and opened ing clay, loam 0r the like, comprising, in comand to cause this material to form a layer bination, a rotatory cylinder having a solid around it, and means for rotating said cylin- 10 circumferential surface, another rotatory ders with different speeds and in opposite di- 5 cylinder having longitudinal ribs on its cirlections.

cumferential surface and adapted to receive In testimony whereof I affix my signature. Yand hold in the spaces between said ribs por- CHRISTIAN GIELOW. 

